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# File activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb, line 697def add_column_options!(sql,options)#:nodoc:sql<<" DEFAULT #{quote(options[:default], options[:column])}"ifoptions_include_default?(options)# must explicitly check for :null to allow change_column to work on migrationsifoptions[:null]==falsesql<<" NOT NULL"endifoptions[:auto_increment]==truesql<<" AUTO_INCREMENT"endend